Targeted gene(s)/phenotype under study
HNRNPH2 (OMIM # 300610)
De novo missense variants in HNRNPH2 have been recently reported in association with Bain type syndromic X-linked intellectual disability (OMIM #300986). To date, only 10 patients (7 females and 3 males) have been described presenting with severe developmental delay and intellectual disability, hypotonia, feeding difficulties and some facial dysmorphism. Additional neurological phenotype consisted of developmental regression, microcephaly, cerebellar anomalies and behavioral anomalies.
All but one variants cluster within the same domain encoding nuclear localization signal (NLS) of HNRPNPH2 and a mutational hotspot was found in the aminoacid 206, affected in 8 out of 10 patients. The exact physiopathologic mechanism related to missense mutations is currently unknown.
We found a novel de novo missense variant in HNRNPH2 in a female patient. We expand the phenotype with unreported clinical manifestations. We aim to collect other clinical and molecular data to further delineate the phenotype and to perform some functional analysis such as X chromosome inactivation and cDNA expression studies.
Stéphanie Moortgat and Isabelle Maystadt
Department of Human Genetics
Institut de Pathologie et de Génétique
Specific requirements beyond clinical data and genotype data sharing
- Re-analysis of DNA samples : Yes
- Resampling of patients : If necessary in some cases
- Linked to a translational/basic research project? Yes